Oscillatory shuttle.



R. ZAHN.

OSGILLATORY SHUTTLE.

APPLICATION FILED MAR. 21, 1912.

1,082,003, Patented Dec. 23, 1913.

WIT/W5 SSE 8 g'g/ lIf/VE/VTOR ATTORNEY ROBERT ZAHN, PLAIIEN, GERMANY.

OSGILLATORY SHUTTLE.

Specification of Letters Patent.

Patented Dec. 23, 1913.

original application filed. October 2, 1911, Serial No. 652,311. Divided, and this application filed March 21, 1912. Serial No. 685,325.

To all whom it may concern Be it known that 1, ROBERT ZAHN, a subject of the German Emperor, residing at Planon, Vogtland, in the Kingdom of Saxony, Germany, have invented certain new and useful; Improvements in Oscillatory Shuttles, of which the following is a specification.

This application is a division from the original application, Ser. No. 652,311, filed October 2, 1911, and it relates to shuttles of the sewing machine of the \Vheclcr & WVilson type.

The subject matter of the invention is clearly illustrated in the accompanying drawing, which forms a part of this specification and in which similar reference numerals denote corresponding parts.

Figure 1 is a side view of a stationary casing with the circular guide for the shuttle therein; Fig. 2 is a section of the shuttle; Fig. 3 is a similar section at a right angle to that of Fig. 2; Fig. 4 is a plan view, Fig. is a side View of the shuttle and Figs. (3-8 illustrate the operation of the shuttle.

1 denotes a metal bracket adapted to be secured to the frame of the embroidering machine (not shown) and aii'i'yiiig the shuttle casing 3. The bearing proper for the rotary shuttle is composed of two sections, the lower section 1 fixed by means of screw bolts 5 to the back of the shuttle casing and an upper section 6 adapted to be temporarily fixed thereto.

lVithin a circular cavity 12 of the casing, a suitable circular driving member 12 is arranged, which may be a toothed ring and which on its face directed toward the body of the shuttle is provided with pins 10 and 11. The part 12 is adapted to carry out a reciprocating rotary motion within the cavity in the wall of the casing 3 and to receive its motion through a gear 13 fixed on a reciprocating shaft driven from the main shaft of the machine (not shown). The reciprocating part 12 by means of its pins 10 and 11 will alternately engage the shuttle to, according to the direction of rotation, oscillate the said shuttle.

My new shuttle of the -Wheeler & lVilson type is made of sheet metal (steel). The same is compressed into the form of a bowl or shell 14, which on its circumference is formed with a hook-shaped projection 20 (Figs. 4. to S) and a neck portion 36, the object of which will be hereinafter specified.

A cover 15. is hinged at 16 to the shell 1-11 to be capable of being tilted into open position 15, indicated by dotted lines in l ig. 3. From the center of the vaulted bottom of the bowl or shell 14, a pin 17 rigidly secured thereto projects toward the cover and is slitted almost throughout its entire length (Fig. 2) to allow of its being expanded so as to hold the bobbin 1S placed thereon from turning. The bobbin 18 is wound around a small paper tube 19 and is made thicker in the center than around the ends. The free end 241 of the cover 15 when closed catches in a groove 25 (Fig. 3) in the upper margin of the shell 141- whereby it is locked in closed position. The cover, as the shell It, is pressed of sheet steel, so as to form a circular :av1ty 2% and a circular shoulder 27 around said cavity. In linear extension of the pin 17 and concentric with the center of the bobbin, the cover 15 has a passage or hole 26 for the bobbin thread, which hole is in the center of the cavity in the cover 15. The center of the bobbin, which coincides with the center of the hole 26 is eccentric relative to the center 29 1) of the driving member 12. At certain points in the shoulder 27 there are two thread openings 30, 31. Fastened at one end, as at 33, in the cavity of the cover 15 is a brake spring 32 of thin steel plate (Fig. 4t). The other end of said spring overlaps the thread portion located between theopcnings 26 and 30. The pressure of the spring on the thread may be regulated by means of an adjustable short finger or lock 34 fulcrumed at 3 1'. The shoulder 97 need not extend all around the cavity 28 in form of a closed ring. lt. sutlices to provide projections around the cavity at points where the thread passes over the shuttle.

35 denotes the stitch plate (Fig. 4).

The einln'oidery surface is denoted by a dotted line XX (Fig. .1-).

The mode of operation is as follows: After the needle 21 has pierced the fabric X -X and entered through the hole in the stitch plate 35 at the side of the path of the oscillating shuttle, the needle thread loop 23 (Fig 5) at the back of the fabric is formed. As the needle begins its return movement and while the shuttle oscillates in the direction of the arrow (Fig. 1) its point 20 is caused to slip through the loop 23', so that the latter engages the neck 36 and While the shuttle continues its rotation, the loop is expanded (Fig. 6). The needle 21 in the meantime is being withdrawn from the fabric. The shuttle thread 18 which is conveyed outward from the bobbin through the passage 26 under the brake spring 32 and through the openings 30, 31 is now carried through the expanded loop 23 (Fig. 7), whereupon the needle thread is drawn taut by well known means (not shown) and the loop 23 slipping off the shuttle is tightened, which completes the stitch. The shuttle then rapidly swings back into its initial positions (Figs. 7 and 8). Owing to the eccentrical position of the passage 26, relative to the center of rotation of the shuttle, so much shuttle thread will be drawn out from the shuttle during the return stroke of the latter, as became necessary by the previous dis placement of the embroidery frame.

The shoulder 27 serves the purpose to allow an undisturbed formation of a stitch and loop, by preventing any of the protruding parts of the cover, as 33, 34-, from overlapping the thread 18 and 23 and catching or damaging the latter. Apart from that, the shoulder 27 also prevents the thread 18, which owing to its natural elasticity, has the tendency to curl, from winding around the needle point 21, which would result in the breaking of the needle. Of great importance for a uniform unwinding of the thread 18 is also the feature, that the thread passage or hole 26 engages with the center of the bobbin, so that the thread unwinding from the latter always finds uniform resistance.

What I claim and desire to secure by Letters Patent is:

1. As an article of manufacture, an oscillatory shuttle pressed of sheet metal, in form of a bowl or shell, with a hook-shaped projection on its circumference and a neck portion, a cover hinged thereto, said cover being pressed of sheet metal to form a cavity on the outside and having a central opening in the cavity, two openings around the cavity and means in the shuttle for fixing the bobbin therein, so that the center thereof coincides with the central opening in the cover.

2. As an article of manufacture, an oscillatory shuttle pressed of sheet metal, a cover hinged thereto, having a cavity on its outside and a central opening in said cavity and two openings around the latter, a brake spring fastened to the cover in the cavity and an adjusting arm cooperating with said brake spring to regulate the tension thereof, and means in the shuttle for fixing the bobbin, so that the center thereof will coincide with the central opening in the cover.

In testimony whereof I afiiX my signature in presence of two witnesses.

ROBERT ZAHN,

Witnesses:

LOUIS DURANT EDWARDS, ROBERT HEINRICH VIER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

